Aluminium, like most metals, forms cations easier than it does anions. The most common for aluminum is Al3+, when it has lost three electrons.
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Aluminum is a cation because it typically loses three electrons to achieve a stable octet configuration, resulting in a positive charge.
anion
Anion is a negative ion (Cl-) and cation is a positive ion (Na+).
AgNO3 consists of the cation Ag+ and the anion NO3-. Ag+ is the silver cation, while NO3- is the nitrate anion.
Boron is an element and is neither an anion or cation. If ionized it would tend to from B3+ and would be thus a cation.
Boron is an element and is neither an anion or cation. If ionized it would tend to from B3+ and would be thus a cation.